CN111933953A - Current collector, pole piece and battery - Google Patents

Current collector, pole piece and battery Download PDF

Info

Publication number
CN111933953A
CN111933953A CN202010851065.2A CN202010851065A CN111933953A CN 111933953 A CN111933953 A CN 111933953A CN 202010851065 A CN202010851065 A CN 202010851065A CN 111933953 A CN111933953 A CN 111933953A
Authority
CN
China
Prior art keywords
layer
current collector
thickness
battery
material layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010851065.2A
Other languages
Chinese (zh)
Inventor
姚毅
姜斌
江柯成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Zenio New Energy Battery Technologies Co Ltd
Original Assignee
Dongguan Tafel New Energy Technology Co Ltd
Jiangsu Tafel New Energy Technology Co Ltd
Jiangsu Tafel Power System Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongguan Tafel New Energy Technology Co Ltd, Jiangsu Tafel New Energy Technology Co Ltd, Jiangsu Tafel Power System Co Ltd filed Critical Dongguan Tafel New Energy Technology Co Ltd
Priority to CN202010851065.2A priority Critical patent/CN111933953A/en
Publication of CN111933953A publication Critical patent/CN111933953A/en
Priority to EP21857193.3A priority patent/EP4148835A1/en
Priority to PCT/CN2021/087684 priority patent/WO2022037092A1/en
Priority to US18/064,201 priority patent/US20230163313A1/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/137—Electrodes based on electro-active polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a current collector which comprises a substrate layer and a conducting layer, wherein the conducting layer is arranged on the surface of the substrate layer, the substrate layer comprises a polymer layer and a metal material layer which are mutually connected, the metal material layer is connected with the conducting layer, and part of the metal material layer is exposed out of the conducting layer. In addition, the invention also relates to a pole piece and a battery. Compared with the prior art, the current collector disclosed by the invention has the advantages that the metal consumption is reduced, the mass energy density of the battery is improved, the structural damage can be caused at the initial stage of thermal runaway, and the thermal runaway of the battery can be prevented.

Description

Current collector, pole piece and battery
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a current collector, a pole piece and a battery.
Background
The lithium ion battery is an ideal power source in the fields of electric vehicles and energy storage due to the outstanding advantages of high energy density, excellent cycle life, high working voltage, lower self-discharge rate, environmental friendliness and the like. However, with the improvement of the energy density of the anode and cathode materials, the safety of the lithium ion battery gradually becomes an important problem restricting the further popularization of the lithium ion battery.
The high-energy-density and high-capacity single battery cell is very easy to generate thermal runaway phenomenon under the abuse conditions of overcharge, overheating, puncture and the like, so that the fire and even explosion accidents are caused, and the personal safety of a user is seriously threatened. Thermal runaway of a battery often results from an internal violent chemical or electrochemical reaction. When the battery is damaged due to the existence of foreign matters inside the battery (such as particles introduced into the battery material, burrs generated on pole pieces or metallic lithium dendrites precipitated during the use of the battery) or external puncture, the positive and negative pole pieces at two sides of the damaged part are possibly conducted to generate a micro short circuit phenomenon, and the short circuit current causes the local temperature rise of the battery, so that a more violent reaction is caused, and combustible substances such as electrolyte in the battery are combusted and exploded.
In view of the above, the present application is particularly proposed to effectively increase the energy density of a battery and improve the safety performance of the battery.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the current collector is provided, the metal consumption is reduced, and meanwhile, the current collector can generate structural damage at the initial stage of thermal runaway so as to prevent the thermal runaway.
In order to achieve the purpose, the invention adopts the following technical scheme:
the current collector comprises a substrate layer and a conductive layer, wherein the conductive layer is arranged on the surface of the substrate layer, the substrate layer comprises a polymer layer and a metal material layer which are connected with each other, the metal material layer is connected with the conductive layer, and part of the metal material layer is exposed out of the conductive layer.
As an improvement of the current collector of the present invention, the metal material layer is adhered to the surface of the polymer layer.
As an improvement of the current collector of the present invention, the metallic material layer is partially embedded in the polymer layer.
As an improvement of the current collector of the present invention, the polymer layer is provided with two layers, and the metal material layer is partially disposed between the two polymer layers.
As an improvement of the current collector of the present invention, two metal material layers are provided, and two metal material layers are respectively provided at two opposite ends of the polymer layer.
As an improvement of the current collector, the conductive layer is formed on the surface of the substrate layer by electroplating, spraying, chemical vapor deposition or physical vapor deposition; or the conducting layer is a metal foil, and the metal foil is pressed on the surface of the substrate layer.
As an improvement of the current collector of the present invention, the polymer layer includes any one of a polyethylene terephthalate layer, a polymethyl methacrylate layer, a polyvinyl alcohol layer, a polyvinyl chloride layer, a polyethylene layer, a polypropylene layer, and a polystyrene layer.
As an improvement of the current collector, the thickness of the polymer layer is 1-20 μm, the thickness of the metal material layer is 1-20 μm, and the thickness of the conductive layer is 0.05-5 μm.
The second purpose of the invention is: there is provided a pole piece comprising a current collector as described in any of the preceding paragraphs of this specification and an active material layer applied to at least one side of the current collector.
The third purpose of the invention is that: the battery comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate and/or the negative plate are/is the plates described in the specification.
Compared with the prior art, the beneficial effects of the invention include but are not limited to:
1) compared with the conventional current collector metal foil, the current collector has the advantages that the metal consumption in the current collector structure can be remarkably reduced, so that the weight of a battery is reduced, and the mass energy density of the battery is improved.
2) The current collector of the invention contains a polymer layer which is melted at a temperature lower than the melting point of the metal foil of the conventional current collector, and the polymer layer can cause electrode failure at the initial stage of heat generation in the battery, so that the further development of electrochemical reaction and internal short circuit is prevented, and the thermal runaway is prevented.
3) The metal material layer and the conducting layer in the current collector are connected and partially exposed out of the conducting layer, the part can be used as a tab and processed by using a conventional ultrasonic welding mode, and the drawing force after welding is the same as that of the metal foil of the conventional current collector.
Drawings
Fig. 1 is one of the structural schematic diagrams of the current collector in the present invention.
Fig. 2 is a second schematic view of the current collector of the present invention.
Fig. 3 is a third schematic view of the current collector of the present invention.
Fig. 4 is a fourth schematic view of the current collector of the present invention.
Fig. 5 is a fifth schematic view of the current collector of the present invention.
Fig. 6 is a sixth schematic view of the current collector of the present invention.
Wherein: 1-a base layer, 2-a conductive layer, 11-a polymer layer, 12-a metallic material layer.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and the accompanying drawings, but the embodiments of the invention are not limited thereto.
1. Current collector
Referring to fig. 1 to 6, a first aspect of the present invention provides a current collector, including a substrate layer 1 and a conductive layer 2, wherein the conductive layer 2 is disposed on a surface of the substrate layer 1, the substrate layer 1 includes a polymer layer 11 and a metal material layer 12 connected to each other, the metal material layer 12 is connected to the conductive layer 2, and a portion of the metal material layer 12 is exposed out of the conductive layer 2. Wherein, the part of the metal material layer exposed out of the conductive layer 2 is cut and formed to be used as a tab.
Referring to fig. 1 and 4, in some embodiments, a metallic material layer 12 is adhered to a surface of the polymer layer 11. The metallic material layer 12 does not completely cover the polymer layer 11, otherwise the energy density cannot be increased, and the short circuit cannot be prevented after the polymer layer 11 is melted. Referring to fig. 2 and 5, in other embodiments, the metallic material layer 12 is partially embedded in the polymer layer 11. Referring to fig. 3 and 6, in still other embodiments, the polymer layer 11 is provided with two layers, and the metallic material layer 12 is partially disposed between the two polymer layers 11.
Referring to fig. 4-6, in some embodiments, two metal material layers 12 are disposed, and two metal material layers 12 are disposed at two opposite ends of the polymer layer 11. So set up for the mass flow body forms both ends and goes out utmost point ear structure.
In some embodiments, the conductive layer 2 is formed on the surface of the substrate layer by electroplating, spraying, chemical vapor deposition or physical vapor deposition. In other embodiments, the conductive layer is a metal foil, and the metal foil is pressed on the surface of the substrate layer.
In the above embodiment, the polymer layer 11 includes any one of a polyethylene terephthalate layer, a polymethyl methacrylate layer, a polyvinyl alcohol layer, a polyvinyl chloride layer, a polyethylene layer, a polypropylene layer, and a polystyrene layer.
In the above embodiment, the thickness of the polymer layer 11 is 1 to 20 μm, the thickness of the metal material layer 12 is 1 to 20 μm, and the thickness of the conductive layer 2 is 0.05 to 5 μm.
2. Pole piece
The invention provides a pole piece, which comprises the current collector and an active substance layer coated on at least one surface of the current collector.
Positive plate
In some embodiments, the positive electrode active material layer includes a positive electrode active material including a compound that reversibly intercalates and deintercalates lithium ions. In some embodiments, the positive active material may include a composite oxide containing lithium and at least one element selected from cobalt, manganese, and nickel. In still other embodiments, the positive electrode active material is selected from lithium cobaltate (LiCoO)2) Lithium nickel manganese cobalt ternary material and lithium manganate (LiMn)2O4) Lithium nickel manganese oxide (LiNi)0.5Mn1.5O4) Lithium iron phosphate (LiFePO)4) One or more of them.
In some embodiments, the positive electrode active material layer further comprises a binder to improve binding of the positive electrode active material particles to each other and also to improve binding of the positive electrode active material to the main body of the pole piece. Non-limiting examples of binders include polyvinyl alcohol, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene 1, 1-difluoride, polyethylene, polypropylene, styrene butadiene rubber, acrylated styrene butadiene rubber, epoxy, nylon, and the like.
In some embodiments, the positive electrode active material layer further includes a conductive material, thereby imparting conductivity to the electrode. The conductive material may include any conductive material as long as it does not cause a chemical change. Non-limiting examples of the conductive material include carbon-based materials (e.g., natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, etc.), metal-based materials (e.g., metal powder, metal fiber, etc., including, for example, copper, nickel, aluminum, silver, etc.), conductive polymers (e.g., polyphenylene derivatives), and mixtures thereof.
Negative plate
In some embodiments, the anode active material layer includes an anode active materialThe negative active material is selected from natural graphite, artificial graphite, mesophase micro carbon spheres (MCMB), hard carbon, soft carbon, silicon-carbon composite, Li-Sn alloy, Li-Sn-O alloy, Sn, SnO2Spinel-structured lithiated TiO2-Li4Ti5O12And one or more of Li-Al alloy.
In some embodiments, the negative active material layer may include a binder that improves the binding of the negative active material particles to each other and the binding of the negative active material to the current collector. Non-limiting examples of binders include polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene 1, 1-difluoroethylene, polyethylene, polypropylene, polyacrylic acid, polyacrylonitrile, styrene butadiene rubber, acrylated styrene butadiene rubber, epoxy, nylon, and the like.
In some embodiments, the anode active material layer further includes a conductive material, thereby imparting conductivity to the electrode. The conductive material may include any conductive material as long as it does not cause a chemical change. Non-limiting examples of the conductive material include carbon-based materials (e.g., natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, etc.), metal-based materials (e.g., metal powder, metal fiber, etc., such as copper, nickel, aluminum, silver, etc.), conductive polymers (e.g., polyaniline, polythiophene, phenylene derivatives), and mixtures thereof.
3. Battery with a battery cell
The third aspect of the invention provides a battery, which comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate and/or the negative plate is the plate of the invention.
The present invention will be described in further detail with reference to comparative examples, test procedures and results.
Comparative example 1
Preparing a positive plate:
NCM523 powder,Mixing SP conductive carbon black, VGCF carbon nano-fiber and PTFE in a ratio of 92:3:3:2, dissolving in a solvent, uniformly stirring to form a slurry, coating the slurry on a positive electrode current collector aluminum foil with the thickness of 12 mu m, drying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount of the slurry per unit area is 17.8mg/cm2。
Preparing a negative plate:
mixing artificial graphite powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 95:1:2:2, dissolving in a solvent, uniformly stirring to form slurry, coating the slurry on a negative current collector copper foil with the thickness of 8 mu m, drying and rolling to form a negative plate with the thickness of 110 mu m, wherein the coating amount of the slurry per unit area is 10.4mg/cm2。
Preparing a diaphragm: a polypropylene porous film having a thickness of 10 μm was used as a separator.
Preparing a battery: winding the positive plate, the diaphragm and the negative plate into a battery cell, wherein the diaphragm is positioned between the adjacent positive plate and the negative plate; and then placing the battery core in an aluminum-plastic packaging bag, injecting electrolyte, and carrying out processes such as packaging, formation, capacity and the like to prepare the battery.
Example 1
In contrast to comparative example 1:
preparing a positive plate:
1) partially bonding an aluminum foil (metal material layer) with the thickness of 9 microns on one surface of a PET film (polymer layer) with the thickness of 12 microns to form a substrate layer, and growing an aluminum plating layer (conductive layer) with the thickness of 2 microns on the surface of the PET film and the surface of part of the aluminum foil by a vacuum evaporation method to obtain the positive electrode current collector shown in the figure 1;
2) mixing NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 92:3:3:2, dissolving the mixture in a solvent, uniformly stirring to form positive electrode slurry, coating the positive electrode slurry on an aluminum coating of a positive electrode current collector, drying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount of the positive electrode slurry per unit area is 17.8mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 2
In contrast to comparative example 1:
preparing a positive plate:
1) taking an aluminum foil (metal material layer) with the thickness of 9 microns, coating a PET polymer layer with the thickness of 12 microns on part of the surface of the aluminum foil, enabling the aluminum foil to be partially embedded into the end part of the PET polymer layer to form a substrate layer, and growing aluminum plating layers with the thickness of 2 microns on the surface of the PET polymer layer and part of the surface of the aluminum foil by a vacuum evaporation method to obtain the positive electrode current collector shown in the figure 2;
2) mixing NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 92:3:3:2, dissolving the mixture in a solvent, uniformly stirring to form positive electrode slurry, coating the positive electrode slurry on an aluminum coating of a positive electrode current collector, drying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount of the positive electrode slurry per unit area is 17.8mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 3
In contrast to comparative example 1:
preparing a positive plate:
1) forming a base layer by sandwiching a portion of an aluminum foil (metal material layer) having a thickness of 9 μm between two PET films (polymer layers) having a thickness of 5 μm, and growing an aluminum plating layer having a thickness of 2 μm on the surface of the PET film and a portion of the surface of the aluminum foil by a vacuum evaporation method to obtain a positive electrode current collector as shown in fig. 3;
2) mixing NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 92:3:3:2, dissolving the mixture in a solvent, uniformly stirring to form positive electrode slurry, coating the positive electrode slurry on an aluminum coating of a positive electrode current collector, drying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount of the positive electrode slurry per unit area is 17.8mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 4
In contrast to comparative example 1:
preparing a positive plate:
1) respectively bonding 2 pieces of aluminum foils (metal material layers) with the thickness of 9 microns to two surfaces of a PET film (polymer layer) with the thickness of 12 microns to form base layers, and growing aluminum plating layers with the thickness of 2 microns on the surfaces of the PET film and parts of the aluminum foils by a vacuum evaporation method to obtain the positive electrode current collector shown in the figure 4;
2) mixing NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 92:3:3:2, dissolving the mixture in a solvent, uniformly stirring to form positive electrode slurry, coating the positive electrode slurry on an aluminum coating of a positive electrode current collector, drying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount of the positive electrode slurry per unit area is 17.8mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 5
In contrast to comparative example 1:
preparing a positive plate:
1) taking two aluminum foils (metal material layers) with the thickness of 9 microns, coating a PET polymer layer with the thickness of 12 microns on part of the surfaces of the aluminum foils, respectively embedding the two aluminum foils into two opposite ends of the PET polymer layer to form a substrate layer, and growing aluminum plating layers with the thickness of 2 microns on the surface of the PET polymer layer and the surface of part of the aluminum foils by a vacuum evaporation method to obtain the positive current collector shown in the figure 5;
2) mixing NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 92:3:3:2, dissolving the mixture in a solvent, uniformly stirring to form positive electrode slurry, coating the positive electrode slurry on an aluminum coating of a positive electrode current collector, drying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount of the positive electrode slurry per unit area is 17.8mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 6
In contrast to comparative example 1:
preparing a positive plate:
1) sandwiching the two aluminum foils (metal material layers) with the thickness of 9 μm between two PET films (polymer layers) with the thickness of 5 μm to form a base layer, and growing aluminum plating layers with the thickness of 2 μm on the surface of the PET film and part of the aluminum foil surface by vacuum evaporation to obtain the positive current collector shown in fig. 6;
2) mixing NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 92:3:3:2, dissolving the mixture in a solvent, uniformly stirring to form positive electrode slurry, coating the positive electrode slurry on an aluminum coating of a positive electrode current collector, drying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount of the positive electrode slurry per unit area is 17.8mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 7
In contrast to comparative example 1:
preparing a negative plate:
1) bonding a part of a copper foil (metal material layer) with the thickness of 3 μm to one surface of a PET film (polymer layer) with the thickness of 6 μm to form a base layer, and growing a copper plating layer with the thickness of 1 μm on the surface of the PET film and the surface of part of the copper foil by a vacuum evaporation method to obtain a negative electrode current collector shown in figure 1;
2) mixing artificial graphite powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 95:1:2:2, dissolving in a solvent, uniformly stirring to form negative electrode slurry, coating the negative electrode slurry on a copper coating of a negative electrode current collector, drying and rolling to form a negative electrode sheet with the thickness of 110 mu m, wherein the coating amount of the negative electrode slurry per unit area is 10.4mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 8
In contrast to example 1:
preparing a negative plate:
1) taking a copper foil (metal material layer) with the thickness of 3 microns, coating a PET polymer layer with the thickness of 6 microns on part of the surface of the copper foil, embedding the copper foil at the end part of the PET polymer layer to form a base layer, and growing copper plating layers with the thickness of 1 micron on the surface of the PET polymer layer and part of the surface of the copper foil by a vacuum evaporation method to obtain the negative electrode current collector shown in the figure 2;
2) mixing artificial graphite powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 95:1:2:2, dissolving in a solvent, uniformly stirring to form negative electrode slurry, coating the negative electrode slurry on a copper coating of a negative electrode current collector, drying and rolling to form a negative electrode sheet with the thickness of 132 mu m, wherein the coating amount of the negative electrode slurry per unit area is 10.4mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 9
In contrast to comparative example 1:
preparing a negative plate:
1) a copper foil (metal material layer) with a thickness of 3 μm is partially sandwiched between two PET films (polymer layers) with a thickness of 6 μm to form a base layer, and a copper plating layer with a thickness of 1 μm is grown on the surface of the PET film and the surface of part of the copper foil by a vacuum evaporation method to obtain a negative electrode current collector shown in FIG. 3;
2) mixing artificial graphite powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 95:1:2:2, dissolving in a solvent, uniformly stirring to form negative electrode slurry, coating the negative electrode slurry on a copper coating of a negative electrode current collector, drying and rolling to form a negative electrode sheet with the thickness of 132 mu m, wherein the coating amount of the negative electrode slurry per unit area is 10.4mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 10
In contrast to comparative example 1:
preparing a positive plate:
1) bonding part of an aluminum foil (metal material layer) with the thickness of 9 μm to one surface of a PET film (polymer layer) with the thickness of 12 μm to form a substrate layer, and growing an aluminum plating layer with the thickness of 2 μm on the surface of the PET film and part of the surface of the aluminum foil by a vacuum evaporation method to obtain the positive electrode current collector shown in figure 1;
2) mixing NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 92:3:3:2, dissolving the mixture in a solvent, uniformly stirring to form positive electrode slurry, and coating the positive electrode slurry on an aluminum coating of a positive electrode current collectorDrying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount per unit area of the positive pole slurry is 17.8mg/cm2。
Preparing a negative plate:
1) bonding a part of a copper foil (metal material layer) with the thickness of 3 μm to one surface of a PET film (polymer layer) with the thickness of 6 μm to form a base layer, and growing a copper plating layer with the thickness of 1 μm on the surface of the PET film and the surface of part of the copper foil by a vacuum evaporation method to obtain a negative electrode current collector shown in figure 1;
2) mixing artificial graphite powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 95:1:2:2, dissolving in a solvent, uniformly stirring to form negative electrode slurry, coating the negative electrode slurry on a copper coating of a negative electrode current collector, drying and rolling to form a negative electrode sheet with the thickness of 110 mu m, wherein the coating amount of the negative electrode slurry per unit area is 10.4mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 11
In contrast to comparative example 1:
1) taking an aluminum foil (metal material layer) with the thickness of 9 microns, coating a PET polymer layer with the thickness of 12 microns on part of the surface of the aluminum foil, embedding the aluminum foil at the end part of the PET polymer layer to form a substrate layer, and growing aluminum plating layers with the thickness of 2 microns on the surface of the PET polymer layer and part of the surface of the aluminum foil by a vacuum evaporation method to obtain the positive electrode current collector shown in the figure 2;
2) mixing NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 92:3:3:2, dissolving the mixture in a solvent, uniformly stirring to form positive electrode slurry, coating the positive electrode slurry on an aluminum coating of a positive electrode current collector, drying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount of the positive electrode slurry per unit area is 17.8mg/cm2。
Preparing a negative plate:
1) taking a copper foil (metal material layer) with the thickness of 3 microns, coating a PET polymer layer with the thickness of 6 microns on part of the surface of the copper foil, embedding the copper foil at the end part of the PET polymer layer to form a base layer, and growing copper plating layers with the thickness of 1 micron on the surface of the PET polymer layer and part of the surface of the copper foil by a vacuum evaporation method to obtain the negative electrode current collector shown in the figure 2;
2) mixing artificial graphite powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 95:1:2:2, dissolving in a solvent, uniformly stirring to form negative electrode slurry, coating the negative electrode slurry on a copper coating of a negative electrode current collector, drying and rolling to form a negative electrode sheet with the thickness of 132 mu m, wherein the coating amount of the negative electrode slurry per unit area is 10.4mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Example 12
In contrast to comparative example 1:
preparing a positive plate:
1) forming a base layer by partially sandwiching an aluminum foil (metal material layer) having a thickness of 9 μm between two PET films (polymer layers) having a thickness of 5 μm, and growing an aluminum plating layer having a thickness of 2 μm on the surface of the PET film and a portion of the surface of the aluminum foil by vacuum evaporation to obtain a positive electrode current collector as shown in fig. 3;
2) mixing NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 92:3:3:2, dissolving the mixture in a solvent, uniformly stirring to form positive electrode slurry, coating the positive electrode slurry on an aluminum coating of a positive electrode current collector, drying and rolling to form a pole piece with the thickness of 120 mu m, wherein the coating amount of the positive electrode slurry per unit area is 17.8mg/cm2。
Preparing a negative plate:
1) a copper foil (metal material layer) with the thickness of 3 μm is partially sandwiched between two PET films (polymer layers) with the thickness of 6 μm to form a base layer, and a copper plating layer with the thickness of 1 μm is grown on the surface of the PET film and the surface of part of the copper foil by a vacuum evaporation method to obtain a negative electrode current collector shown in FIG. 3;
2) mixing artificial graphite powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 95:1:2:2, dissolving in a solvent, uniformly stirring to form negative electrode slurry, coating the negative electrode slurry on a copper coating of a negative electrode current collector, drying and rolling to form a negative electrode sheet with the thickness of 110 mu m, wherein the negative electrode sheet is negativeThe coating amount per unit area of the electrode slurry was 10.4mg/cm2。
The rest is the same as comparative example 1 and will not be described again.
Performance testing
The following tests were performed on the batteries prepared in the above examples and comparative examples:
1) mass energy density: the gravimetric energy density of the cells was tested and calculated in Wh/kg.
2) And (4) safety performance testing: after the battery was fully charged to 4.2V at a constant current and a constant voltage, it was pierced at a speed of 25. + -.5 mm/s using a steel needle having a diameter of 3mm, and the state of the battery was observed. If the battery is not smoked, ignited or exploded, the battery is marked as pass; if the battery is smoking, having sparks and not exploding, marking as undetermined; if the battery is "fired and exploded", it is marked as "failed".
The results of the above tests are shown in Table 1.
TABLE 1 test results
Mass energy density (Wh/kg) Safety performance
Example 1 209 To be determined
Example 2 210 By passing
Example 3 211 By passing
Example 4 206 To be determined
Example 5 207 By passing
Example 6 207 By passing
Example 7 215 To be determined
Example 8 213 By passing
Example 9 215 By passing
Example 10 224 By passing
Example 11 222 By passing
Example 12 223 By passing
Comparative example 1 198 Fail to work
From the test results in table 1, it can be seen that, regardless of whether only the positive plate/the negative plate adopts the current collector of the present invention, or both the positive plate and the negative plate adopt the current collector of the present invention, the mass energy density of the battery manufactured by the current collector is higher than that of the battery manufactured by the conventional current collector, and the safety performance is better. Specifically, as can be seen from comparison of examples 1 to 6, the performance is not affected whether the tab is formed at one end or at both ends, and when the metal material layer is connected with the polymer layer in an embedding or clamping manner, the safety performance of the metal material layer is slightly better than that of the metal material layer connected in a bonding manner.
Therefore, the metal consumption in the current collector structure is obviously reduced, so that the weight of the battery is reduced, and the mass energy density of the battery is improved. Moreover, the polymer layer of the current collector of the invention melts at a temperature lower than the melting point of the metal foil of the conventional current collector, and the electrode can be failed at the initial stage of heat generation in the battery, so that the electrochemical reaction and the further development of internal short circuit are prevented, and the thermal runaway is prevented.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. The current collector is characterized by comprising a substrate layer and a conductive layer, wherein the conductive layer is arranged on the surface of the substrate layer, the substrate layer comprises a polymer layer and a metal material layer which are connected with each other, the metal material layer is connected with the conductive layer, and part of the metal material layer is exposed out of the conductive layer.
2. The current collector of claim 1, wherein the metallic material layer is adhered to the polymer layer surface.
3. The current collector of claim 1, wherein the metallic material layer is partially embedded in the polymer layer.
4. The current collector of claim 1, wherein the polymer layer is provided with two layers, and wherein the metallic material layer is partially disposed between the two polymer layers.
5. The current collector of claim 1, wherein there are two of the metallic material layers, and wherein two of the metallic material layers are disposed at opposite ends of the polymer layer.
6. The current collector of claim 1, wherein the conductive layer is formed on the surface of the base layer by electroplating, spraying, chemical vapor deposition, or physical vapor deposition; or the conducting layer is a metal foil, and the metal foil is pressed on the surface of the substrate layer.
7. The current collector of claim 1, wherein the polymer layer comprises any one of a polyethylene terephthalate layer, a polymethylmethacrylate layer, a polyvinyl alcohol layer, a polyvinyl chloride layer, a polyethylene layer, a polypropylene layer, and a polystyrene layer.
8. The current collector of claim 1, wherein the polymer layer has a thickness of 1-20 μm, the metallic material layer has a thickness of 1-20 μm, and the conductive layer has a thickness of 0.05-5 μm.
9. A pole piece, characterized by comprising the current collector of any one of claims 1 to 8 and an active material layer coated on at least one surface of the current collector.
10. A battery comprising a positive plate, a negative plate, a separator interposed between the positive plate and the negative plate, wherein the positive plate and/or the negative plate is the plate of claim 9.
CN202010851065.2A 2020-08-21 2020-08-21 Current collector, pole piece and battery Pending CN111933953A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202010851065.2A CN111933953A (en) 2020-08-21 2020-08-21 Current collector, pole piece and battery
EP21857193.3A EP4148835A1 (en) 2020-08-21 2021-04-16 Current collector, pole piece and battery
PCT/CN2021/087684 WO2022037092A1 (en) 2020-08-21 2021-04-16 Current collector, pole piece and battery
US18/064,201 US20230163313A1 (en) 2020-08-21 2022-12-09 Current collector, pole piece and battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010851065.2A CN111933953A (en) 2020-08-21 2020-08-21 Current collector, pole piece and battery

Publications (1)

Publication Number Publication Date
CN111933953A true CN111933953A (en) 2020-11-13

Family

ID=73305506

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010851065.2A Pending CN111933953A (en) 2020-08-21 2020-08-21 Current collector, pole piece and battery

Country Status (4)

Country Link
US (1) US20230163313A1 (en)
EP (1) EP4148835A1 (en)
CN (1) CN111933953A (en)
WO (1) WO2022037092A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112615010A (en) * 2020-12-17 2021-04-06 联动天翼新能源有限公司 Novel current collector for battery and preparation method thereof
CN112993262A (en) * 2021-02-05 2021-06-18 珠海冠宇电池股份有限公司 Current collector and application thereof
CN113113566A (en) * 2021-04-09 2021-07-13 珠海冠宇电池股份有限公司 Current collector and application thereof
CN113394404A (en) * 2021-05-21 2021-09-14 东莞塔菲尔新能源科技有限公司 Current collector, electrode pole piece containing current collector and lithium ion battery
CN113506878A (en) * 2021-07-09 2021-10-15 蜻蜓实验室(深圳)有限公司 Composite conductive current collector, electrode plate and lithium ion battery
WO2022037092A1 (en) * 2020-08-21 2022-02-24 江苏正力新能电池技术有限公司 Current collector, pole piece and battery
CN114203958A (en) * 2021-12-13 2022-03-18 珠海冠宇电池股份有限公司 Current collector, pole piece, battery core and battery
WO2022188894A1 (en) * 2021-03-08 2022-09-15 沈晞 Current collector and lithium-ion battery
CN117558926A (en) * 2023-12-29 2024-02-13 浙江煌能新能源科技有限公司 Flexible high-safety lithium ion positive electrode current collector, battery positive electrode and battery
CN117558926B (en) * 2023-12-29 2024-04-26 浙江煌能新能源科技有限公司 Flexible high-safety lithium ion positive electrode current collector, battery positive electrode and battery

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108336357A (en) * 2017-12-14 2018-07-27 合肥国轩高科动力能源有限公司 A kind of ultralight affluxion body in lithium ion batteries and preparation method thereof
CN108390068A (en) * 2018-02-09 2018-08-10 合肥国轩高科动力能源有限公司 A kind of bipolar current collector and preparation method thereof
CN110828775A (en) * 2019-10-15 2020-02-21 江苏卓高新材料科技有限公司 Current collector electrode structure, secondary battery and preparation method of secondary battery
CN212461732U (en) * 2020-08-21 2021-02-02 江苏塔菲尔新能源科技股份有限公司 Current collector, pole piece and battery
CN111933953A (en) * 2020-08-21 2020-11-13 江苏塔菲尔新能源科技股份有限公司 Current collector, pole piece and battery

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022037092A1 (en) * 2020-08-21 2022-02-24 江苏正力新能电池技术有限公司 Current collector, pole piece and battery
CN112615010A (en) * 2020-12-17 2021-04-06 联动天翼新能源有限公司 Novel current collector for battery and preparation method thereof
CN112993262A (en) * 2021-02-05 2021-06-18 珠海冠宇电池股份有限公司 Current collector and application thereof
WO2022188894A1 (en) * 2021-03-08 2022-09-15 沈晞 Current collector and lithium-ion battery
CN113113566A (en) * 2021-04-09 2021-07-13 珠海冠宇电池股份有限公司 Current collector and application thereof
CN113394404A (en) * 2021-05-21 2021-09-14 东莞塔菲尔新能源科技有限公司 Current collector, electrode pole piece containing current collector and lithium ion battery
CN113394404B (en) * 2021-05-21 2023-02-07 江苏正力新能电池技术有限公司 Current collector, electrode pole piece containing current collector and lithium ion battery
CN113506878A (en) * 2021-07-09 2021-10-15 蜻蜓实验室(深圳)有限公司 Composite conductive current collector, electrode plate and lithium ion battery
CN114203958A (en) * 2021-12-13 2022-03-18 珠海冠宇电池股份有限公司 Current collector, pole piece, battery core and battery
CN117558926A (en) * 2023-12-29 2024-02-13 浙江煌能新能源科技有限公司 Flexible high-safety lithium ion positive electrode current collector, battery positive electrode and battery
CN117558926B (en) * 2023-12-29 2024-04-26 浙江煌能新能源科技有限公司 Flexible high-safety lithium ion positive electrode current collector, battery positive electrode and battery

Also Published As

Publication number Publication date
US20230163313A1 (en) 2023-05-25
EP4148835A1 (en) 2023-03-15
WO2022037092A1 (en) 2022-02-24

Similar Documents

Publication Publication Date Title
CN111933953A (en) Current collector, pole piece and battery
US11784355B2 (en) Negative electrode including microcapsule and lithium ion secondary battery including the negative electrode
CN101740799A (en) Secondary battery
CN108493419B (en) Temperature-sensitive composite electrode and preparation method thereof
CN107851838B (en) Lithium ion secondary battery
CN111785925A (en) Pole piece, application and low-temperature-rise safety lithium ion battery containing pole piece
CN112038644A (en) Functional coating, electrode plate and electrochemical device
WO2010131650A1 (en) Non-aqueous electrolyte secondary battery
CN112038573A (en) Pole piece and preparation method thereof, battery core and battery
CN113451586A (en) Electrode plate of secondary battery, secondary battery and preparation method of secondary battery
CN114094039A (en) Electrode plate and lithium ion battery comprising same
JP2000011991A (en) Organic electrolyte secondary battery
CN114583100A (en) Positive plate, preparation method thereof and lithium ion battery
CN110875476A (en) Negative electrode for lithium secondary battery, method for preparing same, and lithium secondary battery
CN218867198U (en) Battery and electric equipment
KR101283331B1 (en) Unification-typed Electrode Assembly and Secondary Battery Using the Same
CN212461732U (en) Current collector, pole piece and battery
CN109755465B (en) Electrode pole piece, electrochemical device and safety coating
CN116014361A (en) Lithium battery diaphragm, lithium battery and preparation method
CN215644574U (en) Electrode plate of secondary battery and secondary battery
JP2010282789A (en) Nonaqueous electrolyte secondary battery
CN110137577B (en) Lithium iron phosphate polymer lithium battery capable of realizing large-current charging and discharging
CN113594464A (en) Electrochemical device and electronic device
JP4207238B2 (en) Stacked organic electrolyte battery
JP2023546184A (en) Electrode assembly and battery cell including the same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right
TA01 Transfer of patent application right

Effective date of registration: 20220117

Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu

Applicant after: Jiangsu Zhengli new energy battery technology Co.,Ltd.

Address before: 211100 Lantian Road 249, Airport Economic Development Zone, Jiangning District, Nanjing City, Jiangsu Province

Applicant before: JIANGSU TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd.

Applicant before: DONGGUAN TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd.

Applicant before: Jiangsu Tafel Power System Co.,Ltd.